How to Lubricate a String Trimmer Shaft

Written by keith dooley
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How to Lubricate a String Trimmer Shaft
Lubricate a string trimmer shaft periodically for proper operation. (Jupiterimages/liquidlibrary/Getty Images)

String trimmers typically feature two-cycle gasoline engines for power. A string trimmer's engine turns the trimmer head, which has the cutting line attached by a flexible metal driveshaft. The shaft runs down the length of driveshaft housing, to which the engine and trimmer head are attached. As the driveshaft is a moving part, it is necessary that it be properly lubricated. Periodical inspection and lubrication of the shaft will help maintain the trimmer in proper working order.

Skill level:

Things you need

  • Screwdriver
  • Gloves
  • Rag
  • Shaft lubricant

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  1. 1

    Place the string trimmer on a convenient work surface. Pull the spark plug wire from the spark plug to prevent accidental starting.

  2. 2

    Locate the gearbox on the end of the aluminium driveshaft housing just above the trimmer head. Loosen and remove the screws holding the gearbox to the shaft housing with a screwdriver.

  3. 3

    Remove the gearbox and attached trimmer head from the shaft housing.

  4. 4

    Pull the flex driveshaft from the shaft housing.

  5. 5

    Wipe down the flex driveshaft with a rag. Remove as much of the old grease and any dirt or debris as possible. Wear a pair of gloves for hand protection.

  6. 6

    Apply a thin coat of shaft lubricant to the entire length of the flex driveshaft. Use a rag, if necessary, to help apply the lubricant.

  7. 7

    Insert the flex driveshaft back into the shaft housing. Slide the gearbox back onto the shaft housing and secure it with the screws that you previously removed.

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